Light bar for a luminaire



FIG. 1 is a perspective view of the new design for a light bar for a luminaire as seen from the side, bottom;

FIG. 2 is a right side elevational view thereof, the left side elevational view being the same;

FIG. 3 is a front elevational view thereof, the rear elevational view being the same;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a top plan view thereof.

The broken lines represent portions of a light bar for a luminaire that form no part of the claimed design. 

CLAIM The ornamental design for a light bar for a luminaire, as shown and described. 